stock is about 16lbs or so....i have the clutchmasters flywheel that is 9.8lbs or whatever, less than 10 anyway......it's not a big deal and isn't harder to drive.....people will tell you that, but they basically just can't drive a manual tranny car IMO.....i'm in traffic a lot, on the interstate a lot, etc....i just don't like the way they require a super fast shift on a turbo car or the rpm (along with boost) will be on the low side.....